Vampires can combat with each other in this part of the game. There are two sections of Combat, Fight list and Arena List . If you can be in the top 10 of fight and Arena list ,you will be rewarded with jewels from the game.
The result of a combat depends on the Vampire Level, number of clans, skill ranks, number of abilities and their level etc.
When a player win a fight he/she gets blood, exp and skill rank from the losing one. If a vampire lose the fight after attacking another still he/she receives exp .And exp are required for leveling up .
For leveling up quickly ,the fight and arena list are really very important. You can gather more exp here rather than doing missions.
If a player is eager to level up quickly ,he/she should fight in the fight/arena list.